Newly signed Raiders running back Isaiah Crowell suffered a torn Achilles tendon during a workout with the team on Tuesday and will miss the upcoming 2019 season, according to a report by ESPN.

Crowell will undergo season-ending surgery next week, the report also disclosed.

The injury adds to the latest issue for the Raiders’ depth chart at running back. Last week, veteran Marshawn Lynch announced his retirement after eleven seasons.  Doug Martin was the team’s leading rusher last season, but he was a free agent.

It’s a brutal blow for Crowell, who signed a one-year, $2.5million contract with Oakland in hopes of rejuvenating his career.  The 26-year-old earned 685 yards on 143 carries and six TDs in 2018.

With the injury to Crowell, newly drafted rookie running back Josh Jacobs will have his work cut out for him. The first-round draft pick is projected as a bell cow after Mike Mayock and Jon Gruden made him the No. 24 overall pick in the 2019 NFL Draft.